We've seen both Twitter and Facebook hire CFOs. This week, social gaming specialist Zynga joined the club when it hired David Wehner to lead finance. Wehner joins the company from investment banking firm Allen & Co., where, according to his bio, he was a managing director responsible for "capital raises" and "M&A transactions."

Zynga accepted $150 million in fresh capital from Softbank in June, and has now collected $366 million in financing since its founding in 2007, TechCrunch reports. An IPO would be the next logical move.

Why farming is a better business than you thinkEven if you don't know Zynga, you likely know its games. Farmville is among its most popular, with more than 80 million active users as of February. Put in context, that means at least one of out every seven of Facebook's 500 million active users plays Farmville. More than a few of them are in my circle of friends.

We don't have specific revenue numbers for Zynga, but a Reuters report from last December suggested the company takes in more than $300 million annually. No wonder private equity investors want a piece of the action.

Acme Packet(Nasdaq: APKT), Baidu(Nasdaq: BIDU), and MercadoLibre(Nasdaq: MELI) all trade for north of 10 times sales, but for good reason. Every one of them is on track to improve earnings by more than 25% a year through 2015. Premium growth commands a premium price. Why would Zynga, whose revenue apparently tripled during 2009, trade any differently?

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Tim Beyers first began writing for the Fool in 2003. Today, he's an analyst for Motley Fool Rule Breakers and Motley Fool Supernova. At Fool.com, he covers disruptive ideas in technology and entertainment, though you'll most often find him writing and talking about the business of comics. Find him online at timbeyers.me or send email to tbeyers@fool.com. For more insights, follow Tim on Google+ and Twitter.